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<?php declare(strict_types = 1); trait Help { public function attachTag( string $type = self::class ): void { var_dump($type); } } $ref = new \ReflectionClass(Help::class); $parameters = $ref->getMethod('attachTag')->getParameters(); foreach ($parameters as $p) { var_dump($p->getName()); var_dump($p->getDefaultValue()); } class HelloWorld { use Help; public function sayHello(DateTimeImutable $date): void { $this->attachTag(); } } var_dump('-------'); $ref = new \ReflectionClass(HelloWorld::class); $parameters = $ref->getMethod('attachTag')->getParameters(); foreach ($parameters as $p) { var_dump($p->getName()); var_dump($p->getDefaultValue()); }
Output for git.master, git.master_jit, rfc.property-hooks
string(4) "type" string(4) "Help" string(7) "-------" string(4) "type" string(10) "HelloWorld"

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